of 6-amino-2-thiouracil 1 with aromatic aldehydes afforded azomethine derivatives 3a,b. The formed azomethines underwent [4+2] cycloaddition with enaminones 4a-c and enaminonitrile 9 to form the corresponding condensed pyrimidines 8a-f and 11a,b, respectively. On the other hand, the interaction of 3a,b with acetylene derivatives 12a,b, 14 afforded the corresponding pyrido[2,3-d]pyrimidines 13a-d and
Utility of 6-Amino-2-thiouracil as a Precursor for the Synthesis of Pyrido[2,3-d]Pyrimidines and their in vitro and in vivo Biological Evaluation
作者:Nadia Mohamed
DOI:10.3797/scipharm.2007.75.9
日期:——
azamethines underwent [4+2] cycloaddition with enaminones 4a-c and enaminonitrile 9 to form the corresponding condensed pyrimidines 8a-f and 11a,b respectively. On the other hand the interaction of 3a,b with acetylene derivatives 12a,b, 14 afforded the corresponding pyrido[2,3-d]pyrimidine 13a-d and 16a,b respectively. The synthesized 2-azadiene 18 failed to add either electron-poor or push-pull dienophile